Statistics for occurrence #1 of “Harper's Ferry” in chapter 8.64 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

... a copy had fallen into McClellan's hands, directed the concentration of the forces under Longstreet and D. H. Hill at Boonsboro‘, where they were to be joined by those under Jackson as soon as Harper's Ferry should be taken. McClellan's orders and correspondence show that he expected a battle at Boonsboro‘, but not at South Mountain or east of it. Pleasonton had found a rear-guard at Turner's Gap...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Harper's Ferry (West Virginia, United States) 10,974 349 304 1 0 user votes

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